immune Definition

immune
adj

1. Having a natural resistance to or protected by inoculation from (a particular disease).

Example: She is immune to German measles
Form: immune to something (especially)
2. Free, exempt or protected from it.

Example: I was immune from prosecution
Form: immune from something (especially)
3. Unaffected by or not susceptible to it.

Example: immune to criticism
Form: immune to something (especially)
4. physiol.
Relating to or concerned with producing immunity.

Derivative: immunity
noun

The state of being exempt, free or protected from something.
Thesaurus: exemption, favour, privilege, licence.

Resistance to or protection from a disease. See also active immunity, passive immunity.
Thesaurus: resistance, protection, immunization; Antonym: vulnerability, susceptibility.

Etymology: 15c in sense 2: from Latin immunis, from munis ready to be of service.

Info:

A word sometimes confused with this one is impunity.